Problem You have two tables, tableA and tableB. You want to retrieve all records from tableA that do not have a matching record in tableB based on a specific column. Input Let’s start with creating two tables and populating them with data. tableA – This will be our primary table where we’ll select data from. […]
How to get records from one table that does not exist in another? Read More »
Problem How to access the “previous row” value in a SELECT statement in SQL? Input id sale_date units_sold 1 2023-01-01 10 2 2023-01-02 15 3 2023-01-03 12 4 2023-01-04 20 Try Hands-On: HERE Source Tables: Gist Desired Solution sale_date current_day_sales previous_day_sales 2023-01-01 10 2023-01-02 15 10 2023-01-03 12 15 2023-01-04 20 12 Solution 1: To
How to access the “previous row” value in a SELECT statement in SQL? Read More »
Problem You have a database table, how to select all columns except specific columns mentioned by the user? Example Syntax: SELECT * [except columnA] FROM tabA; Input id first_name last_name email salary 1 John Doe [email protected] 50000 2 Jane Smith [email protected] 60000 3 Bob Brown [email protected] 55000 This is not possbile in native SQL databases.
How to exclude a column using select * except column? Read More »
